Unit 19: Electromagnetism

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1. In an ideal transformer, power input is:

A Less than output

B Greater than output

C Equal to output

D Zero

2. The main principle of an electric motor is:

A Electrostatics

B Magnetic induction

C Force on current carrying conductor

D Heating effect of current

3. Which scientist discovered the magnetic effect of electric current?

A Michael Faraday

B Hans Christian Oersted

C James Clerk Maxwell

D Isaac Newton

4. The horizontal deflection in CRO is produced by:

A DC voltage

B AC signal

C Time base generator

D Battery

5. When the direction of current is reversed, the direction of force:

A Remains same

B Becomes zero

C Is reversed

D Becomes maximum

6. The deflection of electron beam in CRO helps to measure:

A Mass of electron

B Charge of electron

C Voltage

D Resistance

7. The working principle of electric generator is:

A Heating effect

B Chemical effect

C Electromagnetic induction

D Electrostatic force

8. The magnetic field around a straight current carrying conductor consists of:

A Straight lines

B Circular lines

C Elliptical lines

D Random lines

9. Lenz’s law is a consequence of conservation of:

A Charge

B Energy

C Mass

D Momentum

10. The turning effect of force is called:

A Energy

B Power

C Torque

D Momentum

Unit 19: Electromagnetism

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